In the same way the economist, assigned a practical problem, must know both the essential facts of that problem and the valid deductions to be drawn from those facts.

 
  • 同样,当一个经济学家确定了自己所要分析的问题时,他必须用类似的方法了解与其问题有关的基本事实,以及从这些事实中可以得出的有根据的推论。
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